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when toggle format what by license comment
Jul 17 '14 at 4:32 comment added Graham Chiu I have a fairly high stud, of 1.7m, so I guess creating a floating ceiling sandwiched with some insulation might be feasible, but not sure how expensive that might be.
Jul 17 '14 at 2:57 comment added Hank @wallyk: Nope, R value is a ratio but it's not unitless: it's the ratio of how much energy gets through a certain amount of area based on the temperature difference, in the US the units are ft2-°F-hr/BTU (and units for U value are the inverse).
Jul 16 '14 at 16:10 history edited wallyk CC BY-SA 3.0
amend
Jul 16 '14 at 16:08 comment added wallyk @GrahamChiu: Whoa! I thought R values were dimensionless, and therefore universal. Sorry.
Jul 16 '14 at 6:47 comment added Graham Chiu Sorry, R 2.9 metric is equivalent to R 16.5 US
Jul 16 '14 at 5:21 history answered wallyk CC BY-SA 3.0